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Determination of Safety Categories of Electrical Devices Used in Potentially Explosive Atmospheres

Obiettivo

Objectives
To draft a description of appropriate subdivisions of safety devices. To define all safety devices which are used in the context of electrical equipment for use in potentially explosive atmospheres and study their characteristics and performance in terms of the defined subdivisions. To draft a method for identifying when a particular subdivision should be used, taking into account the application and working environment of the equipment. To determine the correspondence between the proposed subdivisions and the relevant essential safety requirements.

State of progress
A report has been drafted on Task 1. For safety devices which comprise control systems, a target failure measure in terms of IEC 61508 safety integrity level (SIL) is appropriate. For simpler devices, fault tolerance may be more appropriate. Task 2 has commenced with a review of the ATEX requirements and will further consider mapping of SILs onto the ATEX requirements, using E.Ex 'p' apparatus as an example. Task 3 has generated a draft list of safety devices from a consideration of CENELEC standards, a Notified Body's database and manufacturers' catalogues. Tasks 4 and 5 have commenced. The partners are working closely with CENELEC/TC31-WG9 which intends to make use of the project results for standardisation.

Background
Existing CENELEC standards cover different types of electrical apparatus for use in potentially explosive atmospheres. The EU ATEX 100A Directive 94/9/EC has introduced Essential Safety Requirements and a categorisation system. EN 954, under the Machinery Directive, has a different categorisation system for safety-related devices. A categorisation system needs to be developed which is compatible with these and with standards for safety-critical control systems, such as IEC 61508.
Workprogramme
Task 1 is to derive target failure measures in the context of the ATEX requirements. These may be in terms of reliability and/or number of faults required to cause failure on demand. Task 2 is to assess standards such as EN 954 and IEC 61508 for suitability in specifying and certifying that the required target failure measures have been achieved. Task 3 is to identify the types of safety devices which are currently in use. Task 4 is to study these safety devices to determine their characteristics and performance in relation to the target failure measures. Task 5 is to determine a methodology for testing, validation and certification. Task 6 is to prepare a report and proposals for standardisation.

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Coordinatore

Health and Safety Executive (HSE)
Contributo UE
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Indirizzo
Broad Lane
S3 7HQ Sheffield
Regno Unito

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